Rutherford's alpha-particle scattering experiment led to the discovery of:

1. electron
2. proton
3. neutron
4. nucleus

The outermost shell of an atom is known as

1. Valency
2. Valence electrons
3. Nucleus
4. Valence shell

The subatomic particle with positive charge is

1. proton
2. neutron
3. electron
4. nucleon

If the atomic number of an atom is 17 and mass number is 35, then number of neutrons will be

1. 35
2. 17
3. 18
4. 52